c# - WebClient.DownloadString doesn't return value -

i have 1 url special characters | , &. url returning json data.

when trying url in browser run , return json data when trying using webclient.downloadstring(), not work.

example :

using browser :

http://websvr.test.com/abc.aspx?action=b&packetlist=116307638|1355.00  output :  [{"column1":106,"column2":"buying successfully."}] 

using webclient.downloadstring():

    using (webclient wc = new webclient())     {        var json = wc.downloadstring("http://websvr.test.com/abc.aspx?action=b&packetlist=116307638|1355.00");      }  output :  [{"column1":-107,"column2":"invalid parametrer required-(refno|jbprice)!"}] 

you should encode packetlist parameter in url, because includes pipe character, must encoded %7c. browsers automatically encode necessary characters in url, should encode in code manually.

    var json = wc.downloadstring("http://websvr.test.com/abc.aspx?action=b&packetlist=" +                    system.web.httputility.urlencode("116307638|1355.00");